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This article is a stub. You can help by expanding it. A plane can be defined as a vehicle that flies in the sky from one place to the other. Planes are typically used for transportation, but they can also be used for reconnaissance and observation of nature, exploration of nature and travel to new places not visited before or inaccessible by other means, such as soldiers on a battlefield or astronauts beyond Earth's atmosphere. They are often used in war. The world's fastest plane is the SR-71 Blackbird, which travels faster than Mach 6 (approximately 3,300 km/h or 2,000 mph). Some of the most successful planes are modern commercial jets, such as the Boeing 767 or 747, which are used both in commercial aviation and in the military. Rocket planes are sometimes called space planes when they fly in space. The X-15 was an airplane designed to be part of NASA's "space plane" program. It was constructed to be launched into Earth orbit by an orbital launcher and then fly around Earth. The program ended without being tested in this way, so it has no military applications. It was used just to test instruments and systems, including reaction control thrusters for docking with other spacecraft. The SpaceShipOne is a private US spacecraft which was launched from the White Knight carrier aircraft at an altitude of over 100 km, reaching a higher total altitude than any previous aircraft powered by a rocket during a free return trajectory. Still in use is the X-38, a prototype space plane. The Lockheed SR-71 Blackbird is a long-range, Mach 3 strategic reconnaissance aircraft developed from the Lockheed A-12 and YF-12A aircraft by the Lockheed Skunk Works as a Black project. The SR-71 was unofficially named the "Blackbird" due to its unique black paint scheme and speed. The YF-12 had been intended for the U.S. Air Force's Strategic Air Command (SAC) as a Mach 3 bomber escort, but its development was canceled in favor of the A-12 "Aurora". The Blackbird was a counter to the Soviet Union's equivalent reconnaissance aircraft, the Tu-95 "Bear", which was faster and more heavily armed than any American jet interceptor. Although some have been retired from service, many of them are still flying with NASA or other civilian operators, such as NASA Dryden Flight Research Center. Rocket planes are usually designed with a strategic role in mind, such as being able to launch satellites into orbit or being able to land on another planet's surface. The North American X-15 is a rocket-powered aircraft that was flown 199 times from 1959 to 1968, and holds the official world record for fastest speed ever reached by a manned, powered aircraft: 4,520 km/h (2,800 mph) on Aug. 12 1967. Though this was not quite orbital velocity (5 km/h or 3 mph faster than the X-15), it still prompted the USAF to develop the hydrogen-fueled SR-71 Blackbird spy plane. The Space Shuttle is also a rocket plane and can reach orbital velocity and beyond. The airplane played a pivotal role in the development of military aviation in World War I. cfa1e77820
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